The NAPA bolts that klhansen referenced are not correct for the '64-66 Gm trucks. The correct GM bolts are a "shoulder type bolt" with a built-in locking back, no washer, fine thread and pointed on the end.
I have three 64-66 C series trucks, on all three of the trucks, the front sheet metal is generally all attached with the same bolts.
I have found throughout the years that there is no substitute for factory bolts/fasteners, therefore I am very careful to bag and identify each fastener and the area they came from. I then reuse the factory bolts when possible. I sit at my wire buffer wheel cleaning the bolts, line them up and paint them a correct color.
GM started to use bolts that were color coded in the late '60's, metric were one color, SAE, etc., another color. The idiots on the assembly lines only had to remember what color bolt went where.
Bagging and identifying bolts/parts saves a lot of messing around looking for replacement bolts, etc. Wm.
